/*******************************************************************************
* Copyright (c) 2011, 2013 GitHub Inc. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Kevin Sawicki (GitHub Inc.) - initial API and implementation
* François Rey - gracefully ignore linked resources
* Laurent Goubet <laurent.goubet@obeo.fr>
*******************************************************************************/
package org.eclipse.egit.ui.internal.actions;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IResource;
import org.eclipse.egit.ui.Activator;
import org.eclipse.egit.ui.internal.CompareUtils;
import org.eclipse.egit.ui.internal.UIText;
import org.eclipse.egit.ui.internal.dialogs.CommitSelectDialog;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.window.Window;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.handlers.HandlerUtil;
/**
* Compare with previous revision action handler.
*/
public class CompareWithPreviousActionHandler extends RepositoryActionHandler {
/**
* @see org.eclipse.core.commands.IHandler#execute(org.eclipse.core.commands.ExecutionEvent)
*/
public Object execute(ExecutionEvent event) throws ExecutionException {
Repository repository = getRepository(true, event);
if (repository == null)
return null;
IResource[] resources = getSelectedResources(event);
if (resources.length == 1) {
final PreviousCommit previous = getPreviousRevision(event,
resources[0]);
if (previous != null) {
IWorkbenchPage workBenchPage = HandlerUtil
.getActiveWorkbenchWindowChecked(event).getActivePage();
try {
CompareUtils.compare(resources, repository, Constants.HEAD,
previous.commit.getName(), true, workBenchPage);
} catch (IOException e) {
Activator.handleError(
UIText.CompareWithRefAction_errorOnSynchronize, e,
true);
}
}
}
return null;
}
@Override
public boolean isEnabled() {
IResource[] selectedResources = getSelectedResources();
return super.isEnabled() && selectedResources.length == 1 &&
selectionMapsToSingleRepository();
}
private PreviousCommit getPreviousRevision(final ExecutionEvent event,
final IResource resource) {
final List<PreviousCommit> previousList;
try {
previousList = findPreviousCommits();
} catch (IOException e) {
Activator.handleError(e.getMessage(), e, true);
return null;
}
final AtomicReference<PreviousCommit> previous = new AtomicReference<PreviousCommit>();
if (previousList.size() == 0)
showNotFoundDialog(event, resource);
else if (previousList.size() == 1)
previous.set(previousList.get(0));
else {
final List<RevCommit> commits = new ArrayList<RevCommit>();
for (PreviousCommit pc : previousList)
commits.add(pc.commit);
HandlerUtil.getActiveShell(event).getDisplay()
.syncExec(new Runnable() {
public void run() {
CommitSelectDialog dlg = new CommitSelectDialog(
HandlerUtil.getActiveShell(event), commits);
if (dlg.open() == Window.OK)
for (PreviousCommit pc : previousList)
if (pc.commit.equals(dlg
.getSelectedCommit())) {
previous.set(pc);
break;
}
}
});
}
return previous.get();
}
private void showNotFoundDialog(ExecutionEvent event, IResource resource) {
final Shell shell = HandlerUtil.getActiveShell(event);
final String message = MessageFormat
.format(UIText.CompareWithPreviousActionHandler_MessageRevisionNotFound,
resource.getName());
shell.getDisplay().asyncExec(new Runnable() {
public void run() {
MessageDialog
.openWarning(
shell,
UIText.CompareWithPreviousActionHandler_TitleRevisionNotFound,
message);
}
});
}
}